Exploring Wavelet Packet Decomposition and Limit Value of High-speed Railway Wheel Flat Excitation Response
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摘要: 扁疤是轨道交通车辆车轮踏面的典型故障之一, 其对于列车运行的平稳性和安全性有很大影响。目前尚未对不同速度下的扁疤限值制定统一的标准。本文对动力学仿真计算得到的轮轨力随机响应采用一种全局性的小波包分解处理方法, 提取轮轨力随机信号的能量系数作为评判指标, 从能量特征的角度研究了不同速度等级下的车轮扁疤安全限值, 并与在时域信号中提取轮轨力随机响应的最大值、均值和脉冲因子作为评判扁疤安全限值的方法相比较。结果表明: 小波包能量系数从全局性角度描述轮轨力特性, 节点能量系数呈线性规律, 可作为高速铁路车轮扁疤安全限值的评判指标。研究得出当列车速度在150~250 km/h范围内, 扁疤长度应控制在30 mm以内; 当列车速度在250~350 km/h范围内, 扁疤长度应控制在25 mm以内。Abstract: Wheel flat is a typical fault of the wheel tread of a railway vehicle, which has a great influence on its stability and safety. At present, there is no uniform standard for the safety limit of wheel flat at different speeds. In this paper, a global wavelet packet decomposition method is used to deal with the random response of the wheel-rail force obtained with dynamic simulation. The energy coefficient of the random response of wheel-rail force is extracted as the evaluation index. The safety limits of wheel flat at different speeds are studied from the angle of energy characteristics and compared through extracting the maximum value, mean value and impulse factor of the random response of wheel-rail force as the evaluation index of safety limits of wheel flat in time domain. The results show that the wavelet packet energy coefficient can describe the wheel-rail force characteristics from the global perspective. The node energy coefficient shows the linearity of wheel-rail force, which can be used as the evaluation index of safety limits of high-speed railway wheel flat. The study shows that when the train speed is in the range of 150-250 km/h, the length of wheel flat should be controlled within 30 mm. When the train speed is in the range of 250-350 km/h, the length of wheel flat should be controlled within 25 mm.
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Key words:
- wheel flat /
- wavelet packet decomposition /
- energy characteristics /
- safety limit
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表 2 节点能量系数
速度/(km·h-1) 扁疤长度/mm 节点1 节点2 节点3 节点4 150 0 100.00 0.00 0.00 0.00 20 99.81 0.09 0.02 0.06 30 99.57 0.21 0.04 0.13 40 99.26 0.41 0.05 0.18 200 0 99.98 0.01 0.01 0.00 20 99.77 0.08 0.03 0.07 30 99.47 0.20 0.06 0.18 40 99.08 0.42 0.08 0.29 250 0 99.95 0.04 0.01 0.00 20 99.74 0.11 0.04 0.06 30 99.42 0.25 0.06 0.17 40 98.98 0.48 0.08 0.29 300 0 99.85 0.11 0.03 0.00 20 99.64 0.15 0.06 0.07 30 99.33 0.24 0.11 0.19 40 98.92 0.41 0.14 0.35 350 0 99.76 0.18 0.04 0.01 20 99.58 0.22 0.08 0.05 30 99.26 0.32 0.14 0.15 40 98.93 0.51 0.13 0.23 
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